黄河透明棺材图片:(1)3Y=x+5;2x+5y (2)3x+5y=5;3x-4y=23

x-y=1,x^2-y^2+3x-5y的值 方程组{5（x-y)=3(x+y)-2 (1) (x+y)*2=3(x-y)-4 求x和y的值 若 x/3y = y/2x-5y =6x-15y/x 5x+11y-3xy怎么变成2(x-1)+8(y-1)=3(x-1)(y-1)？ 一道数学题：若x平方+y平方+2x-4y+5=0，先化简[(x/x-y)-1]/[y平方/x+y] (1)3Y=x+5;2x+5y (2)3x+5y=5;3x-4y=23 (x-y)^2×(y-x)^3=??? 已知X+Y=-4，求1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y 求(2x-3y+z)-3{x-2[-z+(x-y)]-(3y-5x)}+1的结果是多少？ 已知3X-6Y=5,则2Y-X+1=( )